Question

  Giải hộ

Answer 1

a) \(\dfrac{4}{25}=\dfrac{2^2}{5^2}=\left(\dfrac{2}{5}\right)^2\)

\(-\dfrac{1}{8}=\dfrac{\left(-1\right)^3}{2^3}=\left(-\dfrac{1}{2}\right)^3\)

b) Ta có:

\(\left[\left(0,4\right)^2\right]^3=\left(0,4\right)^{2\cdot3}=\left(0,4\right)^6\)

Mà: \(\left(0,4\right)^6< \left(0,4\right)^5\)

Vậy \(\left[\left(0,4\right)^2\right]^3< \left(0,4\right)^5\)